Stool



FIG. 1 is a perspective view of a stool, showing my new design from the front, top and left side;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side view being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a stool, as shown and described. 